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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | May 15, 2015 | Apr. 02, 2014
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock, shares issued | 7,753,717 us-gaap_CommonStockSharesIssued | 7,753,717 us-gaap_CommonStockSharesIssued |  |
Maximum [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Securities allowed for issuance |  |  |  | $ 300.0 land_ValueOfSecuritiesAllowedForIssuance / us-gaap_RangeAxis = us-gaap_MaximumMember
Common Stock [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Common stock shares issued | 1,223,453 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,223,453 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Gross proceeds from issuance of common stock | 15.0 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Follow-on Offering [Member] | Subsequent Event [Member] |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Gross proceeds from issuance of common stock |  |  | $ 14.3 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = land_TwoThousandFourteenFollowOnOfferingCostMember |
Common stock, shares issued |  |  | 1,250,000 us-gaap_CommonStockSharesIssued / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = land_TwoThousandFourteenFollowOnOfferingCostMember |
Price per share |  |  | $ 11.40 us-gaap_SharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = land_TwoThousandFourteenFollowOnOfferingCostMember |

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